Multiaxial elongations of polyisobutylene and the predictions of several network theories

Demarmels, A.; Meissner, J.

doi:10.1007/bf01188367

Cited by 4 publications

(5 citation statements)

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“…The experimental data in shear and uniaxial extension for a poly(isobutylene) melt and a polystyrene melt were reported by Demarmels et al [28] and Takahashi et al [29]. These results revealed that h E (t) coincided with 3h(t) at short time region.…”

Section: Resultssupporting

confidence: 83%

Effects of aggregation structure on rheological properties of thermoplastic polyurethanes

Yamasaki

Nishiguchi

Kojio

et al. 2007

Polymer

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Section: Resultssupporting

confidence: 83%

Effects of aggregation structure on rheological properties of thermoplastic polyurethanes

Yamasaki

Nishiguchi

Kojio

et al. 2007

Polymer

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“…Remarkably, these predictions are in good agreement with the experimental observations by Takahashi et al [20], Laun and Schuch [13], and Demarmels and Meissner [7].…”

Section: Analytical Predictions For Stress Growth and Relaxationsupporting

confidence: 84%

“…The predicted sequence of stress curve pile-up Eq. (13) agrees with experimental evidence[7,13,20,22].…”

supporting

confidence: 92%

“…For this purpose, we analyze a large portion of the reported nonlinear viscoelasticity data referring to polymers subjected to more than one type of extension. These include: (v-viii) Uniaxial, planar and equibiaxial h(λ) data on the commercial HDPE S870H (M w = 104 k, M w /M n = 5.5) presented by Wagner et al [16], and on a commercial, low T g , polyisobutylene (PIB: M w = 120 kg/mol, M w /M n = 2.2), reported by Wagner and Demarmels [15]; both these studies were performed on Meissner inspired extensional rheometers [6][7][8][9].…”

Section: The Power-law Damping Function: Justification and Significancementioning

confidence: 96%

“…5 the main qualitative features of the stress curve pile-up during start-up flow for several cases of general biaxial extension, as evidenced in Refs. [7,13,20,22], and expressed by Eq. (13).…”

Section: Comparison With Experimentsmentioning

confidence: 99%

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Simple constitutive modelling of nonlinear viscoelasticity under general extension

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Voyiatzis

Gotsis

2006

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Experimental methods in polymer melt rheology

Meissner

1993

Makromolekulare Chemie. Macromolecular Symposia

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Experimental developments in different areas of polymer melt rheology and recent results are reviewed: Shear oscillations were performed with mixtures of polyisobutylenes (PIB) of relatively small molecular mass distributions and with blends of polystyrene (PS) and polymethylmethacrylate (PMMA). For the latter, the interfacial tension between the melts of PS and PMMA can be derived from the results. ‐ In constant shear rate flow, the measurement of the first normal stress difference N1 in a commercial cone‐and‐plate rotational rheometer is simple if the test temperature is kept extremely constant. By a further modification a partial integral of the pressure distribution is measured from which the second normal stress difference N2 can be determined. ‐ The molecular orientation in shear flow results in a rheological anisotropy that can be studied in a parallel‐plate shear rheometer in which the polymer melt sample can arbitrarily be sheared in two perpendicular directions. ‐ For melt elongation by rotary clamps constant, arbitrary ratios of the strain rate components can be applied. Planar elongations of the PIB samples indicate an influence of the width of the molecular mass distribution. More general elongations with a change of the strain rate ratio during the test are of especial interest as is documented by the comparison of the resulting stresses with predictions from different network theories. ‐ In a rheometer for simple elongation at 170°C, recovery after melt extension of the PS/PMMA blends reveals a value of the interfacial tension equal to the one obtained from shear oscillations.

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Multiaxial elongations of polyisobutylene and the predictions of several network theories

Cited by 4 publications

References 0 publications

Effects of aggregation structure on rheological properties of thermoplastic polyurethanes

Effects of aggregation structure on rheological properties of thermoplastic polyurethanes

Simple constitutive modelling of nonlinear viscoelasticity under general extension

Experimental methods in polymer melt rheology

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